/*
 * Daniel R Padilla
 *
 * Copyright (c) 2008, Daniel R Padilla
 *
 * This copyrighted material is made available to anyone wishing to use, modify,
 * copy, or redistribute it subject to the terms and conditions of the GNU
 * Lesser General Public License, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution; if not, write to:
 * Free Software Foundation, Inc.
 * 51 Franklin Street, Fifth Floor
 * Boston, MA  02110-1301  USA
 */
package org.databasefacade.select;

import java.util.ArrayList;

import org.databasefacade.table.column.Column;

public class OrderBy {
	private ArrayList ordering = new ArrayList();
	
	public void column(Column col) {
		String sql = col.getTableAlias() + "." + col.getColumnName();
		add(sql);
	}
	
	/*
	public void function(Function function) {
		if ( ! function.isAggregate() ) {
			add(function.getSQL());
		}
	}
	*/
	
	public void calculation(Arithmetic calc) {
		add(calc.getSQL());
	}
	
	public void calculation(String calc) {
		add(calc);
	}
	
	public String getSQL() {
		StringBuilder sb = new StringBuilder("");
		if ( ordering.size() > 0 ) {
			sb.append("\nORDER BY ");
			String comma="";
			for (int i=0; i < ordering.size(); i++) {
				sb.append(comma + ordering.get(i).toString());
				comma="\n        ,";
			}
		} 
		return sb.toString();
	}
	
	private void add(String sql) {
		if ( !ordering.contains(sql) ) {
			ordering.add(sql);			
		}
	}
}
